Powershell找不到类构造函数？

我的异常发生在这个代码块的foreach块中：

[void] Watch([System.IO.DirectoryInfo]$Directory, [string[]]$sFilters, [FSWatcherOptions]$Options) {
        foreach($sFilter in $sFilters) {
            $FSEventData = [FSEventData]::new($Directory, $sFilter, $Options)
            ...
        }
    }

这是依赖关系，在同一个脚本中，异常上面的80行左右。

enum FSWatcherOptions {
    Recurse = 1
}
class FSEventData : IComparable, IEquatable[Object] {
    [System.IO.DirectoryInfo]$Watched
    [string]$sFilter
    [FSWatcherOptions]$Options

    FSEventData()  {
        param {
            [System.IO.DirectoryInfo]$Watched,
            [string]$sFilter,
            [FSWatcherOptions]$Options
        }
        $this.Watched = Watched
        $this.sFilter = sFilter
        $this.Options = Options
    }
    [string] ToString() {
        return "Watched:$($this.Watched.FullName)Filter:$($this.sFilter)Options:$($this.Options.ToString())"
    }
    [FSEventData] Clone() {
        return [FSEventData]::new($this.Watched, $this.sFilter, $this.Options)
    }
    hidden [int] CompareWatched([FSEventData]$that) {
        [int] $out = 0
        if ($this.Watched -gt $that.Watched) {$out =  1}
        if ($this.Watched -lt $that.Watched) {$out = -1}
        return $out
    }
    hidden [int] CompareFilter ([FSEventData]$that) {
        [int] $out = 0
        if ($this.sFilter -gt $that.sFiler) {$out =  1}
        if ($this.sFilter -lt $that.sFiler) {$out = -1}
        return $out
    }
    hidden [int] CompareOptions([FSEventData]$that) {
        [int] $out = 0
        if ($this.Options -gt $that.Options) {$out =  1}
        if ($this.Options -lt $that.Options) {$out = -1}
        return $out
    }
    [int] CompareTo($that) {
        If (-Not($that -is [FSEventData])) {
            Throw "Not Comparable!!"
        }
        [int]$out = 0
        $out = $this.CompareWatched([FSEventData]$that)
        if ($out -eq 0) {$out = $this.CompareFilter}
        if ($out -eq 0) {$out = $this.CompareOptions}
        return $out
    }
    [bool] Equals  ($that) {
        If (-Not($that -is [FSEventData])) {
            Throw "Not Equatable!!"
        }
        return {
            $this.Watched -eq $that.Watched -and
            $this.sFilter -eq $that.sFilter -and
            $this.Options -eq $that.Options
        }
    }
}

包含IComparable和IEquatable方法用于调试目的。我收到的例外是：

Cannot find an overload for "new" and the argument count: "3".
At X:\FFFF\FileSystemEventProcessor.ps1:95 char:13
+             $FSEventData = [FSEventData]::new($Directory, $filter, $O ...
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

我在这里错过了什么，因为代码看起来很好，直到我昨天最后一次编辑。我花了几个小时试图找出问题所在，但最终我的搜索结果是干的。

您在.ctor中有一些语法错误。在PowerShell类构造函数中没有param { ... }语法。然后，使用Watched，sFilter和Options，就好像它们是命令，如果你示例化的类没有.ctor参数，它们将结束抛出CommandNotFoundException。
要修复该错误，请将.ctor定义从以下位置更改：

FSEventData() {
    param {
        [System.IO.DirectoryInfo] $Watched,
        [string] $sFilter,
        [FSWatcherOptions] $Options
    }
    $this.Watched = Watched
    $this.sFilter = sFilter
    $this.Options = Options
}

To（注意删除了param { ... }并向.ctor添加了参数）：

FSEventData(
    [System.IO.DirectoryInfo] $Watched,
    [string] $sFilter,
    [FSWatcherOptions] $Options
) {
    $this.Watched = $Watched
    $this.sFilter = $sFilter
    $this.Options = $Options
}

然后你可以示例化FSEventData而不会出现问题：

[FSEventData]::new((Get-Item .), 'foo', [FSWatcherOptions]::Recurse)

# Watched                sFilter Options
# -------                ------- -------
# C:\User\Documents\pwsh foo     Recurse

Powershell找不到类构造函数？

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